/*
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 * and open the template in the editor.
 */

package servlets;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *  Servlet usado para la preparación de información a presentar de
 * los archivos html resultantes de la extracción
 *  @author hayner Benavides Moreno y Jorge Hernan Londoño Echeverri
 */
public class ServletDescarga extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet ServletDescarga</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet ServletDescarga at " + request.getContextPath () + "</h1>");
            out.println("</body>");
            out.println("</html>");
            */
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        doPost(request, response);// si entra por get haga loq eu hace en post
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try{//determine la ruta del archivo a presentar, si es nulo envie vacio
            String ruta = (request.getParameter("ruta")==null)?"":request.getParameter("ruta");
            File archivo = new File(ruta);

            if(!ruta.equals("") && archivo.exists()){// si la ruta no es vaci ay esxiste el archivo
                FileInputStream entrada = new FileInputStream(archivo);
                ServletOutputStream salida = response.getOutputStream();
                byte[] salidaBytes = new byte[4096];
                while(entrada.read(salidaBytes, 0, 4096)!=-1){
                    salida.write(salidaBytes);
                }
                entrada.close();
                salida.flush();
                salida.close();

                response.setContentType("application/octet-stream");
                response.setHeader("Content-Disposition","attachment;filename=temp.txt");

            }
            else{
                //si no cumple con esto vaya a la apgina agenteextractor.jsp
                getServletContext().getRequestDispatcher("/agenteExtractor.jsp").forward(request, response);
            }
        }catch(Exception e){
            System.out.println(e.getMessage());
        }
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
